Passive indifference to faith has left Europe's churches mostly empty. But debate over religion is more intense and strident than it has been in many decades. Religion is re-emerging as a big issue in part because of anxiety over Europe's growing and restive Muslim populations and a fear that faith is reasserting itself in politics and public policy. That is all adding up to a growing momentum for a combative brand of atheism, one that confronts rather than merely ignores religion.
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